CN104998916A - Energy-saving device of rolling device - Google Patents
Energy-saving device of rolling device Download PDFInfo
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- CN104998916A CN104998916A CN201510347021.5A CN201510347021A CN104998916A CN 104998916 A CN104998916 A CN 104998916A CN 201510347021 A CN201510347021 A CN 201510347021A CN 104998916 A CN104998916 A CN 104998916A
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Abstract
The invention aims to provide a control device of a rolling device. When rolled materials are cooled, cooling water is injected at the time when cooling efficiency is high, and therefore the water injection amount can be reduced, and energy consumption can be reduced. The device comprises a plurality of rolling racks (24) and cooling devices (50) between the racks. The rolling racks (24) are arranged on a rolling production line in series and used for rolling the rolled materials (12) of metal materials conveyed on the rolling production line. The cooling devices (50) between the racks are arranged between the rolling racks (24) and inject the cooling water to the conveyed rolled materials. The water injection amount of the cooling devices (50), located on the upstream side of the rolling production line, between the racks is large, and the water injection amount of the cooling devices (50), located on the downstream side of the rolling production line, between the racks is small.
Description
The present patent application is international application no is PCT/JP2011/069571, international filing date is on August 30th, 2011, the application number entering National Phase in China is 201180073192.3, the divisional application of the application for a patent for invention that name is called " energy saver of rolling equipment ".
Technical field
The present invention relates to the energy saver of rolling equipment.
Background technology
In thin plate hot rolling or heavy plate rolling, generally to the stocking perfusion cooling water of metal material, and temperature to be controlled to given target temperature.In addition, contact due to Rolling roller or for the roller roller that the transmits high temperature stocking with about 1000 DEG C, therefore generally cooling water also will be utilized to cool Rolling roller or roller roller.The cooling water of the latter in thin plate hot rolling or heavy plate rolling etc. is not only use in the rolling of object with high-temperature material, but also uses for when object with normal temperature stocking in cold rolling grade.
Rolling equipment has the circulating path of cooling water, and under most cases, cooling water was temporarily used afterwards by the casing drawn water to eminence.For the movement of water, pump must be used and drive this pump motor, its drive unit.Thus, if the circulation of water can be reduced, then the energy needed for driving of pump can be reduced.
Such as, in patent document 1 (Japanese Patent Laid-Open 2006-272339 publication) " cooling means of Rolling roller and device ", disclosing when there is no stocking, making the pump sending cooling water carry out the method for low cruise.
Prior art document
Patent document
Patent document 1: Japanese Patent Laid-Open 2006-272339 publication
Patent document 2: Japanese Patent Laid-Open 2005-313202 publication
Patent document 3: Japanese Patent Laid-Open 2008-260047 publication
Summary of the invention
Invent technical problem to be solved
But, in the cooling means disclosed by above-mentioned existing temperature control, patent document 1, do not consider the viewpoint making stocking, Rolling roller, roller roller cool how efficiently.Therefore, the water injection rate of cooling water is more, and the energy needed for the driving of above-mentioned pump does not also reduce fully.Thus, this energy-saving effect not talkative is sufficient.
The present invention completes to solve the problem, its object is to, thering is provided the control device of following rolling equipment: when cooling stocking, pouring into cooling water by the time point higher at cooling effectiveness thus can water injection rate be reduced, and realizing the reduction of energy consumption.
In addition, the present invention completes to solve the problem, its object is to, there is provided the control device of following rolling equipment: under non-rolling in-process stock, i.e. so-called idling conditions when cooling roller bed roller or Rolling roller, pour into cooling water by the time point higher at cooling effectiveness thus can water injection rate be reduced, and realizing the reduction of energy consumption.
The technical scheme that technical solution problem adopts
In order to achieve the above object, the first invention is a kind of energy saver of rolling equipment, it is characterized in that, comprising:
Multiple rolling machine frame, the plurality of rolling machine frame is configured on rolling line with tandem, is rolled the stocking of the metal material transmitted on described rolling line; And
Interstand cooling device, this interstand cooling device is separately positioned between described multiple rolling machine frame, and to transmitted described stocking perfusion cooling water,
In described interstand cooling device, be set as that the water injection rate from the interstand cooling device being positioned at described rolling line upstream side is more, the water injection rate from the interstand cooling device being positioned at downstream is less.
In addition, in order to achieve the above object, the second invention is a kind of energy saver of rolling equipment, it is characterized in that, comprising:
First rolling machine frame, the stocking of this first rolling machine frame to the metal material transmitted on rolling line is rolled;
Second rolling machine frame, this second rolling machine frame is configured in the downstream of described first rolling machine frame;
3rd rolling machine frame, the 3rd rolling machine frame is configured in the downstream of described second rolling machine frame;
First interstand cooling device, this first interstand cooling device is arranged between described first rolling machine frame and described second rolling machine frame, and to transmitted described stocking perfusion cooling water;
Second interstand cooling device, this second interstand cooling device is arranged between described second rolling machine frame and described 3rd rolling machine frame, and to transmitted described stocking perfusion cooling water;
Using state switch unit, this using state switch unit can switch the state of stocking described in the state of stocking described in described second rolling machine frame rolling and not rolling; And
Inject position setup unit, this water filling position setup unit is at stocking described in described first rolling machine frame rolling and forbid the water filling from described first interstand cooling device under the state of stocking described in described second rolling machine frame not rolling, and license is from the water filling of cooling device between described second rolling machine frame.
In addition, in order to achieve the above object, the 3rd invention is a kind of energy saver of rolling equipment, it is characterized in that, comprising:
Multiple rolling machine frame, the plurality of rolling machine frame is configured on rolling line with tandem, is rolled the stocking of the metal material transmitted on described rolling line; And
Interstand cooling device, this interstand cooling device is separately positioned between described multiple rolling machine frame, and to transmitted described stocking perfusion cooling water,
Described interstand cooling device is arranged on rolling machine frame outlet side compared to its upstream side closer to the position of the rolling machine frame entrance side in downstream.
In addition, in order to achieve the above object, the 4th invention is a kind of energy saver of rolling equipment, it is characterized in that, comprising:
Multiple water filling device, the plurality of water filling device is configured in the downstream of final rolling machine frame, and to transmitted stocking perfusion cooling water;
Restriction determining unit, this restriction determining unit to whether exist must from described multiple water filling device, the restriction that carry out water filling of each water filling device of configuration continuously judges; And
Water filling device interval setup unit, this water filling device interval setup unit, when not having described restriction, separates more than one compartment of terrain in described multiple water filling device, sets the water filling device that will pour into cooling water.
In addition, in order to achieve the above object, the 5th invention is a kind of energy saver of rolling equipment, it is characterized in that, comprising:
Roller roller, this roller roller is arranged on rolling line, transmits stocking;
Multiple water filling device, the plurality of water filling device is to described roller roller perfusion cooling water;
Identifying unit, whether this identifying unit is in described roller roller the idling conditions not transmitting described stocking judges; And
Water injection unit during idle running, during this idle running, water injection unit is when roller roller is in described idling conditions, makes described multiple water filling device intermittently pour into cooling water to described roller roller.
In addition, in order to achieve the above object, the 6th invention is a kind of energy saver of rolling equipment, it is characterized in that, comprising:
Rolling roller, this Rolling roller is arranged on rolling machine frame, and is rolled the stocking of metal material;
Roller cooling device, this roller cooling device is to described Rolling roller perfusion cooling water;
Identifying unit, this identifying unit judges the idling conditions whether described Rolling roller is in stocking described in non-rolling;
Rolling roller power consumption acquiring unit, this Rolling roller power consumption acquiring unit is under described idling conditions, and the multiple operating points in low speed rotation region, obtain the power consumption for driving described Rolling roller respectively;
Pump power consumption acquiring unit, this pump power consumption acquiring unit, under described idling conditions, at described multiple operating point, obtains respectively and provides the pump of cooling water to carry out the power consumption driven for roller cooling device described in subtend; And
Operating point selection unit, this operating point selection unit under described idling conditions, in described multiple operating point, select for drive the power consumption of described Rolling roller, with operating point for driving the power consumption sum of described pump minimum.
Invention effect
According to foregoing invention, be passed to surface as the stocking of cooled body or the internal heat of rolling equipment (Rolling roller or roller roller) by heat transfer, at the time point perfusion cooling water that the surface temperature of cooled body raises.The temperature difference of surface temperature and cooling water is larger, and cooling effectiveness is higher.Therefore, according to the present invention, the water injection rate of cooling water can being reduced, the reduction of the energy consumption of the pump for making cooling water circulation etc. can being realized.
Accompanying drawing explanation
Fig. 1 is the figure for illustration of thin plate hot-rolling mill and the summary as the circulating path of the cooling water of object.
Fig. 2 is the figure of the heat conducting computational methods for illustration of cooled body.
Fig. 3 is the figure for illustration of the central temperature of cooled body when moment t1 and moment t2 pours into cooling water to cooled body and the variations in temperature of surface temperature.
Fig. 4 is the figure for illustration of the central temperature of cooled body when moment t1 and moment t3 pours into cooling water to cooled body and the variations in temperature of surface temperature.
Fig. 5 is the figure for illustration of the feature structure in embodiments of the present invention 1.
Fig. 6 is the figure for illustration of the feature structure in embodiments of the present invention 2.
Fig. 7 is the flow chart of the control program in embodiments of the present invention 2, performed by control device.
Fig. 8 is the figure for illustration of the feature structure in embodiments of the present invention 3.
Fig. 9 is the figure for illustration of the feature structure in embodiments of the present invention 4.
Figure 10 is the figure for illustration of other modes in embodiments of the present invention 4.
Figure 11 is the flow chart of the control program in embodiments of the present invention 4, performed by control device.
Figure 12 is the figure for illustration of the feature structure in embodiments of the present invention 5.
Figure 13 is the flow chart of the control program in embodiments of the present invention 5, performed by control device.
Figure 14 is the figure for illustration of other modes in embodiments of the present invention 5.
Figure 15 is the figure for illustration of the feature structure in embodiments of the present invention 6.
Figure 16 is the figure be described for the change of the roll surface temperature to the predetermined portions about work roll surface.
Figure 17 is the figure for illustration of the feature structure in embodiments of the present invention 6.
Figure 18 is the flow chart of the control program in embodiments of the present invention 6, performed by control device.
Detailed description of the invention
Below, with reference to accompanying drawing, embodiments of the present invention are described in detail.In addition, also the repetitive description thereof will be omitted to add identical label for key element common in each figure.
[basic structure of rolling equipment]
Fig. 1 is the figure of the basic structure for illustration of rolling equipment.In Fig. 1, an example as rolling equipment shows the summary of thin plate hot-rolling mill 10 and the circulating path as the cooling water of object.For convenience of description, the hot-rolling mill of thin plate shown in Fig. 1, but applicable rolling equipment of the present invention is not limited thereto.The present invention is also applicable to the heavy plate mill etc. forming the roughly the same circulatory system.In addition, simplify in Fig. 1 and the circulatory system is shown, be in fact configured with more casing, pit, pump, motor.
The rolling line upstream of the thin plate hot-rolling mill 10 shown in Fig. 1, is provided with the heating furnace 14 heated the stocking 12 of metal material.Stocking 12 is sent to downstream (right side of Fig. 1) by roller roller from rolling line upstream (left side of Fig. 1).In the downstream of heating furnace 14, be provided with the descaler (scale breaker) 16 of the oxide skin for removing stocking 12 surface.The roughing mill 18 of rolling in-process stock 12 is provided with in the downstream of descaler 16.The downstream of roughing mill 18 is provided with descaler 20.The finishing mill 22 be rolled down to by stocking 12 till final thickness of slab is provided with in the downstream of descaler 20.
Finishing mill 22 comprises with multiple rolling machine frames 24 of tandem configuration.Each rolling machine frame 24 comprises: working roll 26, and this working roll 26 contacts while carry out rotating the Rolling roller to stretch thinner by stocking 12; And backing roll 28, this backing roll 28 corrects for the flexure of the rotor shaft direction to working roll 26.Working roll 26 is provided with to its motor driven and drive unit thereof.Backing roll 28, by the friction between working roll 26, rotates along with the rotation of working roll 26.
The downstream of the finishing mill 22 shown in Fig. 1, the fine finishining outlet side thermometer 30 that the temperature (FDT:Finisher Delivery Temperature (finishing mill outlet temperature)) being provided with the stocking 12 to finishing mill outlet side measures.In the downstream of fine finishining outlet side thermometer 30, be provided with runout table (ROT:Run Out Table) 32.In the downstream of ROT32, the coiling temperature meter 34 that the temperature (CT:Coiling Temperature (coiling temperature)) being provided with the stocking before to coiling machine 12 measures.In the downstream of coiling temperature meter 34, be provided with the coiling machine 36 batching stocking 12 in coiled type.Thus, thin plate hot-rolling mill 10, from upstream towards downstream, is made up of heating furnace 14, roughing mill 18, finishing mill 22, ROT32, coiling machine 36 etc.
Then, the summary of the circulating path of the cooling water being object with thin plate hot-rolling mill 10 is described.The dotted arrow of Fig. 1 represents the flow direction of the cooling water of circulation.In thin plate hot-rolling mill 10, store the casing 38 of cooling water and be arranged on than roughing mill 18, finishing mill 22, position that ROT32 is higher.In addition, than roughing mill 18, finishing mill 22, position that ROT32 is lower, form the recovery path of cooling water, be connected with purification cooling processing device 40.Purification cooling processing device 40 is connected with cooling water pit 42 by pipe arrangement.Cooling water pit 42 is connected with casing 38 by pipe arrangement.These pipe arrangements are provided with pump 44.On pump 44, be provided with its motor 46 driven and drive unit thereof.
Sometimes direct cooling water is called being used for directly being poured into stocking 12 with the cooling water carrying out cooling.In addition, sometimes will for cold rolling equipment (such as, working roll 26, backing roll 28, ROT32 etc.) and perfusion cooling water be called indirect cooling water.Below, when distinguishing the kind of cooling water, direct cooling water, indirect cooling water is designated as.
The entrance side of the rolling machine frame 24 shown in Fig. 1 and at least side of outlet side are provided with roller cooling device 48.Pair roller cooling device 48 provides cooling water from casing 38, can pour into indirect cooling water to working roll 26, backing roll 28.In addition, between adjacent rolling machine frame 24, be provided with interstand cooling device (ISC:Inter Stand Coolant) 50.The rolling machine frame 24 of finishing mill 22 has 5 ~ 7 usually, and therefore interstand cooling device 50 has 4 ~ 6.There is provided cooling water to interstand cooling device 50 from casing 38, direct cooling water can be poured into the stocking 12 on roller roller.In addition, ROT32 is provided with cold bed 52.On cold bed 52, be provided with multiple ROT water filling device 54.There is provided cooling water to ROT water filling device 54 from casing 38, direct cooling water can be poured into the stocking 12 on the roller roller of ROT32.
Direct cooling water, indirect cooling water all reclaim, to recycle after for cooling.But, comprise the foreign matters such as iron powder in the cooling water used, or be in high temperature.Therefore, cooling water be made temporarily to turn back to purification cooling processing device 40.Afterwards, in order to again use as cooling water, then make it be back to cooling water pit 42, in order to add desired pressure when water filling, then be drawn water to the casing 38 of eminence, using as cooling water.For the movement of these water, use pump 44 and to its motor 46 driven and drive unit thereof.
In addition, the thin plate hot-rolling mill 10 shown in Fig. 1 comprises control device 60.At the input side of control device 60, except being connected with above-mentioned fine finishining outlet side thermometer 30, coiling temperature meter 34, be also connected with the various sensor of the state for detecting stocking 12 or rolling equipment.At the outlet side of control device 60, except be connected with above-mentioned roller cooling device 48, interstand cooling device 50, ROT water filling device 54, pump 44 drive unit, the rotary speed of working roll 26 (mill speed) can be made to carry out changing drive unit except, be also connected with the various actuator of the state for controlling stocking 12 or rolling equipment.In addition, control device 60 has the set-up function setting various control information (such as, the target temperature of stocking 12) etc. according to the material of stocking 12 or product specification.
Control device 60, according to the output of above-mentioned various control information and various sensor, makes various actuator carry out action according to preset program, thus controls the state of stocking 12 or rolling equipment.
In rolling equipment as described above, generally to pour into cooling water to stocking, to be controlled to desired temperature.When pouring into cooling water to cool to the stocking of high temperature, giving cooled target temperature, in order to reach this target temperature, controlling various actuator.In thin plate hot-rolling mill 10 shown in Fig. 1, the target of the temperature (FDT) of the stocking 12 of finishing mill 22 outlet side is given to control device 60, control device 60, in order to reach this FDT target temperature, performs fine finishining outlet side temperature and controls (FDTC:FDT control).The interstand cooling device 50 that the operating side of FDTC is mill speed and is arranged between rolling machine frame 24.
In addition, in thin plate hot-rolling mill 10 shown in Fig. 1, give the target of the temperature (CT) of the stocking 12 before coiling machine 36 to control device 60, control device 60, in order to reach this CT target temperature, performs the oiler temperature control (CTC:CT control) of control CT.The operating side of CTC is the ROT water filling device 54 be arranged on the ROT32 between finishing mill 22 and coiling machine 36.
[design of the present invention]
Then, basic idea of the present invention common in each embodiment is described.Basic idea of the present invention is based on following formula.(1) formula is the formula of the heat trnasfer representing water-cooled.In this explanation, heat trnasfer refers to the movement of the heat energy between the surface of cooled body and cooling water.Heat transfer refers to the movement of the heat energy of the inside of cooled body.
[mathematical expression 1]
Q
w＝-h
wA
w(T
surf-T
w) (1)
Here,
Q
w: the hot-fluid [W] on the surface of cooled body
Wherein, the situation seizing heat from cooled body is set to Q
w< 0.
H
w: the heat transfer coefficient [W/mm between cooled body and cooling water
2/ K]
A
w: the surface area [mm of cooled body
2]
T
surf: the surface temperature [K] of cooled body
T
w: cooling water temperature [K]
When the temperature of cooled body is higher than cooling water, the larger expression cooled body of absolute value of the hot-fluid that (1) formula obtains easily is cooled.Because cooled body has certain volume, if therefore this volume is divided into small component, and consider the variations in temperature T of its i-th micro volume part
i, be then expressed from the next.
[mathematical expression 2]
Here,
ρ: the density [kg/mm of cooled body
3]
C
p: the specific heat [J/kg/deg] of cooled body
V
i: i-th micro volume [mm
3]
Δ t: time variations [s]
Σ Q: hot-fluid sum.In hot-fluid, except the Q of (1) formula
win addition, also there is the component etc. caused by radiation, Air flow convection current, heat transfer, tackle them and all consider.Wherein, the situation seizing heat from cooled body is set to Q < 0.
Here, shown in Fig. 2 on the thickness direction of cooled body one be divided into five example.Mark 1 successively from upper surface, the numbering of 5, be usually expressed as i-th.For heat Calculation calculus of finite differences (separate differential equation numerical analysis method in one) in, generally speaking, represent the micro volume after the segmentation shown in upper figure of Fig. 2 with the node (point) shown in figure below of Fig. 2, the turnover of internodal heat is stated as (2) formula.In explanation of the present invention, also adopt this method.
From (1) formula (2) formula, because the density of the physics value as cooled body, specific heat and micro volume cannot change, therefore in order to reduce the temperature of cooled body, as long as increase Σ Q.Therefore following method is considered.
(A) the surface temperature T of cooled body is increased
surfwith the temperature T of cooling water
wdifference.
(B) the heat transfer coefficient h between cooled body and cooling water is increased
w.
(C) the surface area A of cooled body is increased
w.
About (B), knownly depend on surface temperature and the surface state such as the oxide-film being attached to metal material surface.About (C), when the air spots of cooled body is sliding, surface area becomes large.But (B) (C) is not controllable amount.
(A) in, the temperature of cooling water as above-mentioned illustrated in fig. 1, due to be as the result of cooling processing device to realize the temperature of cooling water, therefore not can easily change.But the surface temperature of cooled body then can try every possible means to change.
When getting unit length, unit width to cooled body, certainly exist thickness, in a thickness direction there is Temperature Distribution.First cool from surface due to general, therefore in the inside of thickness direction, there is the temperature higher than surface.Internal heat spreads out of the heat transfer that cooled body is depended on surface.Heat transfer is represented by the pyroconductivity (physics values different from heat trnasfer) as a kind of physics value.
In order to improve the surface temperature of cooled body, need, by separating the heat transfer of certain hour from internal high temperature part after cooling, to wait for that heat is passed to surface.
Below, cooled body exists is utilize milling train to connect the situation of processed metal material and stocking and is the situation of the rolling equipments such as Rolling roller.
In the present invention, based on above-mentioned consideration, when cooled body is metal material, determines the time point of perfusion cooling water, improve surface temperature in order to the heat from its inside.By carrying out water filling at this time point, thus improve cooling effectiveness, and improve energy-saving effect.
In addition, in the present invention, when cooled body is rolling equipment, be not rolled under the state and so-called idling conditions of processing or do not transmit stocking, determine the time point of perfusion cooling water, improve surface temperature in order to the heat from rolling equipment inside.By carrying out water filling at this time point, thus improve cooling effectiveness, and improve energy-saving effect.
Use Fig. 3 and Fig. 4 illustrates cooling means when combining above-mentioned idea.In Fig. 3 and Fig. 4, cooled body, with the order of the state of the state of the state of moment t1, moment t2, moment t3, moves on straight line or in a rotational direction.Fig. 3 represents at moment t1 and moment t2 the central temperature (node 3) of cooled body during cooled body perfusion cooling water and the variations in temperature of surface temperature (node 1).Fig. 4 represents at moment t1 and moment t3 the central temperature (node 3) of cooled body during cooled body perfusion cooling water and the variations in temperature of surface temperature (node 1).
As shown in Figure 3, when utilizing cooling water to cool cooled body, after moment t1 just carries out water filling, the surface temperature of cooled body sharply declines.In Fig. 3, due to the time point perfusion cooling water of the moment t2 after and then moment t1, therefore cooled body just obtained cooling before the heat that inside has fully spreads out of surface.Therefore, the hot-fluid of (1) formula diminishes, and cooling effectiveness is not good.
On the other hand, as shown in Figure 4, after moment t1 carries out water filling, when moment t2 does not carry out water filling, the heat of cooled body inside can spread out of surface, and therefore surface temperature uprises.The time point of the moment t3 shown in Fig. 4, compared with the time point of the moment t2 shown in Fig. 3, the surface temperature of cooled body raises.Therefore, if the time point of the moment t3 shown in Fig. 4 carries out water filling, then the hot-fluid of (1) formula becomes large, and cooling effectiveness uprises.
Below, each embodiment based on above-mentioned basic idea of the present invention is described.
In embodiment 1 to 4, the situation that cooled body is stocking 12 is described.Particularly, in embodiment 1 to 3, to being described the cooling of stocking 12 of being implemented by interstand cooling device 50.In embodiment 4, to being described the cooling of stocking of being implemented by ROT water filling device 54.
In embodiment 5, the situation that cooled body is roller roller is described.
In embodiment 6, the situation that cooled body is Rolling roller is described.
Embodiment 1.
In existing FDTC, when operating between frame cooling device 50, not considering cooling effectiveness and energy-saving effect ground, deciding the water injection rate from interstand cooling device 50 for controlling to FDT target temperature.In contrast to this, embodiments of the present invention 1, by when being cooled stocking by interstand cooling device, at the time point perfusion cooling water that cooling effectiveness is higher, thus can reduce water injection rate, realizing the reduction of the energy consumption being used for cooling water circulation.
Fig. 5 is the figure for illustration of the feature structure in embodiments of the present invention 1.Fig. 5 is the enlarged drawing of the finishing mill 22 shown in Fig. 1.On finishing mill 22, tandem is provided with multiple rolling machine frame 24a ~ 24d.In Fig. 5, stocking 12 rolling from left to right.Between each rolling machine frame, be provided with interstand cooling device (ISC) 50a ~ 50c, direct cooling water is poured into transmitted stocking 12.Therefore, stocking 12 temperature in the process transmitted towards right side (downstream) declines.What the surface temperature of stocking 12 was higher is left side (upstream side), now from interstand cooling device 50 water filling to reduce temperature, when the identical water yield, cooling effectiveness is higher.
In the explanation of each figure below, when not distinguishing rolling machine frame 24a ~ 24d especially, be simply designated as rolling machine frame 24.When not distinguishing interstand cooling device 50a ~ 50c especially, be designated as interstand cooling device 50.In addition, the quantity of these devices is not limited to the quantity shown in each figure.
In present embodiment, in view of above-mentioned cooling effectiveness, be set to upstream side more from the water injection rate of interstand cooling device 50, downstream is less.Namely, in present embodiment, control device 60 is within the control range meeting the FDT target temperature determined according to the material etc. of stocking 12, be set as that the water injection rate from the interstand cooling device 50 being positioned at rolling line upstream is more, the water injection rate from the interstand cooling device 50 being positioned at downstream is less.In Fig. 5, represent the flow direction of cooling water from interstand cooling device towards the arrow of stocking, the thickness of arrow represents the size of flow.As shown in Figure 5, control device 60 is set as that the water injection rate from the interstand cooling device 50a being positioned at upstream is maximum, and the water injection rate from interstand cooling device 50b, 50c of being configured at downstream is less.
According to this structure, and the water yield from all interstand cooling devices 50 is set to compared with constant situation, the cooling water flow be cooled to by stocking needed for FDT target temperature can be reduced.Thus, by improving cooling effectiveness, and reduce water injection rate, thus the electricity of the pump etc. for cooling water circulation can be reduced.Therefore, it is possible to the energy consumption in minimizing rolling.
Embodiment 2.
Fig. 6 is the figure for illustration of the feature structure in embodiments of the present invention 2.Fig. 6 is the enlarged drawing of the finishing mill 22 shown in Fig. 1.On finishing mill 22, tandem is provided with multiple rolling machine frame 24.In the following description, by multiple rolling machine frame 24 from rolling line upstream side be designated as successively the first rolling machine frame 24a, the second rolling machine frame 24b, the 3rd rolling machine frame 24c.Here for convenience of description, will the rolling machine frame 24 of the most upstream of finishing mill 22 be positioned at as the first rolling machine frame 24a, but the present invention is not limited thereto.Such as, also can using the rolling machine frame 24 that is positioned at beyond most upstream as the first rolling machine frame 24a.First rolling machine frame 24a is provided with working roll 26a, the second rolling machine frame 24b is provided with working roll 26b, the 3rd rolling machine frame 24c is provided with working roll 26c.In explanation below, when not distinguishing working roll 26a ~ 26c especially, be simply designated as working roll 26.
Each rolling machine frame 24 can to making working roll 26 contact with stocking 12, for the operational mode of rolling; And do not make working roll 26 contact with stocking 12, the be not used in operational mode of rolling switch.Make each rolling machine frame 24 which operational mode carry out action with, decided according to the material of stocking 12 or product specification etc. by control device 60.In addition, between adjacent rolling machine frame 24, be provided with interstand cooling device (ISC) 50.In Fig. 6, between the first rolling machine frame 24a and the second rolling machine frame 24b, be provided with the first interstand cooling device 50a, between the second rolling machine frame 24b and the 3rd rolling machine frame 24c, be provided with the second interstand cooling device 50b.
What represent in Fig. 6 is carry out illusory, to be namely not used in the operational mode of rolling situation to the second rolling machine frame 24b.Illusory rolling machine frame can be any rolling machine frame, is set to the second rolling machine frame 24b here.Stocking 12 is when being rolled by rolling machine frame 24a, and its heat also can be dissipated by working roll 26a.Therefore, after just leaving rolling machine frame 24a, the surface temperature of stocking 12 can decline.Due to heat recovery Effects, along with advancing to rolling machine frame 24b, 24c, surface temperature can uprise.Thus, compared to the first interstand cooling device 50a, use the second interstand cooling device 50b cooling effect when identical water injection rate higher.
Therefore, in present embodiment, under the state that the first rolling machine frame 24a is used for rolling and the second rolling machine frame 24b is not used in rolling, do not pour into cooling water from the first interstand cooling device 50a, and pour into cooling water from the second interstand cooling device 50b.
Fig. 7 is the flow chart in order to realize the control program that above-mentioned action is performed by control device 60.As prerequisite, control device 60 according to the material of stocking 12 or product specification, can decide to be that all rolling machine frames are used for rolling, or a part is used for rolling.Here, when by rolling machine frame 24a or 24b some for rolling, rolling machine frame 24a is used for rolling.In addition, perform the program shown in FDTC, Fig. 7 to perform in the control range that can reach FDT target temperature.
In program shown in Fig. 7, first determine whether the operational mode (step S100) of the first rolling machine frame 24a for rolling.When the operational mode of the first rolling machine frame 24a for rolling, next determine whether the operational mode (step S110) that the second rolling machine frame 24b is not used in rolling.When the second rolling machine frame 24b is not used in the operational mode of rolling, control device 60 is forbidden from the first interstand cooling device 50a to stocking 12 water filling (step S120).Meanwhile, control device 60 is permitted from the second interstand cooling device 50b to stocking 12 water filling (step S130).
On the other hand, in the process of step S110, when the operational mode of the second rolling machine frame 24b for rolling, next, control device 60 is permitted from the first interstand cooling device 50a to stocking 12 water filling and from the second interstand cooling device 50b to both stocking 12 water fillings (step S140-S150).
According to this structure, when existence is not used in the rolling machine frame of rolling, due to water filling can be carried out at the time point that cooling effectiveness is higher, therefore, it is possible to reduce the cooling water flow be cooled to by stocking needed for FDT target temperature.Thus, by improving cooling effectiveness, and reduce water injection rate, thus the electricity of the pump etc. for cooling water circulation can be reduced.Therefore, it is possible to the energy consumption in minimizing rolling.
In addition, also can to the control of the structure application implementation mode 2 of above-mentioned embodiment 1.Namely, control device 60 still can comprise water filling ratio setup unit, this water filling ratio setup unit is under the state of the first rolling machine frame 24a and the second rolling machine frame 24b rolling in-process stock 12, permit the water filling from the first interstand cooling device 50a and the second interstand cooling device 50b, and the water injection rate from the second interstand cooling device 50b is set as fewer than the water injection rate from the first interstand cooling device 50a.
Embodiment 3.
Fig. 8 is the figure for illustration of the feature structure in embodiments of the present invention 3.Fig. 8 is the enlarged drawing of the finishing mill 22 shown in Fig. 1.Structure shown in Fig. 8 is substantially identical with the structure described in Fig. 5 or Fig. 6, but the configuration of interstand cooling device 50 is being improved to difference in this point.Such as, when stocking 12 is rolled by rolling machine frame 24a, its heat also can be dissipated by working roll 26a.Therefore, after just leaving rolling machine frame 24a, the surface temperature of stocking 12 can decline.If the surface temperature of the stocking 12 declined contacting with working roll 26a carries out water filling after rising because heat recovers, then cooling effectiveness can be improved.
Therefore, in present embodiment, interstand cooling device 50a is arranged on rolling machine frame 24a outlet side compared to its upstream side closer to the position of the rolling machine frame 24b entrance side in downstream.Also identical for other interstand cooling devices 50.
As shown in Figures 5 and 6, generally speaking, after being arranged on the outlet side of rolling machine frame 24 nearby (its downstream nearby), but in present embodiment, interstand cooling device 50 is arranged on rolling machine frame 24 entrance side in downstream to interstand cooling device 50.Due to the surface temperature of stocking 12 that declines contacting with working roll 26 to rise because heat recovers after pour into cooling water, therefore, it is possible to improve cooling effectiveness.By improving cooling effectiveness, thus can water injection rate be reduced, the electricity of the pump etc. for cooling water circulation can be reduced.Therefore, it is possible to the energy consumption in minimizing rolling.
In addition, also can to the structure of the structure application implementation mode 3 of above-mentioned embodiment 1 or embodiment 2.That is, also can in the structure of embodiment 1 or embodiment 2, each interstand cooling device 50 is arranged on rolling machine frame 24 outlet side than its upstream side closer to the position of rolling machine frame 24 entrance side in downstream.
Embodiment 4.
In CTC, when operating the ROT water filling device 54 of ROT32, the refrigerating mode of stocking 12 is according to guaranteeing that the viewpoint of the material such as intensity or ductility decides sometimes.Such as, have and carry out noting the cooling of water-cooled prime at the upstream side of ROT32 or carry out the rear class cooling etc. of water filling in downstream.In the strict material of so-called material, need to manage refrigerating mode and the temperature history of cooling midway is also controlled, but the undemanding situation of material specification is also more.In this case, only the desired value of the CT of the outlet side temperature as ROT32 is managed in the past.In contrast to this, in present embodiment, by when being cooled the strict material of non-material by ROT water filling device 54, at the time point perfusion cooling water that cooling effectiveness is higher, thus can water injection rate be reduced, realizing the reduction of the energy consumption being used for cooling water circulation.
Fig. 9 is the figure for illustration of the feature structure in embodiments of the present invention 4.Fig. 9 is the enlarged drawing of the ROT32 shown in Fig. 1.On ROT32, multiple ROT water filling device 54a, 54b, 54c, outlet side from the final rolling machine frame 24 of finishing mill 22, configure continuously towards coiling machine 36 (omitting diagram in Fig. 9).In explanation below, when do not distinguish especially ROT water filling device 54a, 54b, 54c, be simply designated as ROT water filling device 54.
Operate above-mentioned interstand cooling device 50, to make the temperature that measured by fine finishining outlet side thermometer 30 in above-mentioned FDTC consistent with desired value (FDT target temperature).Operation ROT water filling device 54, to make the temperature that measured by coiling temperature 34 in CTC consistent with desired value (CT target temperature).But, in the method for operating of the ROT water filling device 54 undertaken by CTC, if such as ROT water filling device 54a, 54b, 54c, 54d, 54e, water filling continuously like this, then the surface temperature of stocking 12 can not rise completely because heat recovers, and 54b, 54c, the like this cooling effect of the cooling water of consecutive hours diminish.
Therefore, in present embodiment, separate the ROT water filling device 54 that more than one is interposed between setting perfusion cooling water in the multiple ROT water filling device 54 of continuous print.
As shown in Figure 9, by as ROT water filling device 54a, 54c, 54e, cool at spaced intervals, thus heat recovers between 54a to 54c, and the surface temperature of stocking 12 rises, and when the identical water yield, cooling effect improves.Figure 10 is the figure of other modes represented in embodiments of the present invention 4.And, as shown in Figure 10, if as ROT water filling device 54a, 54d, so spaced apart, then cooling effectiveness improves further.
In the experiment utilizing cooling device to carry out of reality, if cooling effectiveness when 54a, 54b, 54c, so continuous water filling is set to 1, then as shown in Figure 9 54a, 54c, 54e, cooling effectiveness is 1.5 when separating a cooling device like this, as shown in Figure 10 54a, 54d, cooling effectiveness is 1.8 when separating two cooling devices like this.Wherein, in the material of stocking 12, existence must pour into the restrictions such as cooling water from each ROT water filling device 54 of configuration continuously, pay the utmost attention to quality compared to energy-conservation needs.
Figure 11 is the flow chart in order to realize the control program that above-mentioned action is performed by control device 60.In program shown in Fig. 7, first, control device 60 determines whether to be set with and must limit (step S200) from each ROT water filling device 54a, 54b, 54c, perfusion cooling water etc. of configuration continuously.Control device 60, when rolling equipment is started working, sets limit setting mark according to the material etc. of stocking 12.Such as, when stocking 12 is the strict material of material, by limit setting flag settings for opening.In step S200, according to the open/close state of limit setting mark, above-mentioned restriction can be determined whether.
When be set with must pour into the restriction of cooling water from each ROT water filling device 54 of continuously configuration, next, control device 60 is set to and makes each ROT water filling device 54 from configuration continuously pour into cooling water (step S210).
On the other hand, in step S200, when being judged to not set above-mentioned restriction, next, control device 60 separates more than one and is interposed between in each ROT water filling device 54 the ROT water filling device (step S220) set for cooling.
According to this structure, when stocking 12 is not the strict material of material, the cooling water flow be cooled to by stocking 12 needed for CT target temperature can be reduced.Thus, by improving cooling effectiveness, and reduce water injection rate, thus the electricity of the pump etc. for cooling water circulation can be reduced.Therefore, it is possible to the energy consumption in minimizing rolling.
Embodiment 5.
In embodiment 5, the control of cooling roller bed roller is described.The roller roller perfusion indirect cooling water transmitting high temperature stocking is cooled, deforms to prevent the temperature of roller from uprising.Really, under the state transmitting stocking, water filling is always needed.But, when not transmitting stocking and so-called idling conditions, also cooling with certain water yield in the past, and not considering how efficiently pair roller cools.In contrast to this, in the control of present embodiment, by the idling condition, the time point higher at cooling effectiveness pours into indirect cooling water to ROT water filling device 54, thus can reduce water injection rate, realizes the reduction of the energy consumption being used for cooling water circulation.
Figure 12 is the figure for illustration of the feature structure in embodiments of the present invention 5.Figure 12 is the enlarged drawing of the ROT32 shown in Fig. 1.Structure shown in Figure 12 is substantially identical with the structure described in Fig. 9, Figure 10, but in Figure 12, further illustrate for by stocking 12 from the upstream side (left side of Figure 12) of rolling line side (right side of Figure 12) roller roller 62 of transmitting towards downstream.In addition, Figure 12 represents that roller roller 62 does not transmit the idling conditions of stocking 12.On ROT32, be provided with multiple roller roller 62 for transmitting stocking 12.In addition, ROT water filling device 54 can pour into cooling water to roller roller 62 under being configured to the state do not transmitted on roller roller 62 at stocking 12.
Control device 60, when transmitting high temperature stocking 12, in order to protect roller roller 62 self and not have an impact to the temperature of the stocking 12 of cooling next time, sometimes passes through afterwards at stocking 12, from ROT water filling device 54 together water filling, carrys out cooling roller bed roller 62.Now, such as, not make to be set to lasting 5 seconds from the time of ROT water filling device 54 together water filling, but first water filling together within 2 seconds, stop n second, then water filling together within 2 seconds.The method is as follows: in during stopping n second, the heat being stored in roller inside spreads out of roller surface, and surface temperature rises, and by carrying out water filling to it, thus cooling effectiveness improves, and consequently makes total water injection time be reduced to 4 seconds from 5 seconds.In addition, be set to observation until the time of next stocking arrival, as much as possible the n of stopping obtained longer second on one side.
That is, in present embodiment, when roller roller 62 is in the idling conditions not transmitting stocking, each ROT water filling device 54 is made intermittently to pour into cooling water to roller roller 62.
Figure 13 is the flow chart in order to realize the control program that above-mentioned action is performed by control device 60.In program shown in Figure 13, first, determine whether to be in the idling conditions (step S300) roller roller 62 not transmitting stocking 12.
When being in roller roller 62 and not transmitting the idling conditions of stocking 12, control device 60 makes each ROT water filling device 54 intermittently pour into cooling water (step S310).Specifically, as mentioned above, in water filling 2 second first together, n second is stopped, then water filling 2 second together.
On the other hand, when not being idling conditions, be namely in roller roller when just transmitting the state of stocking 12, control device 60 makes ROT water filling device 54 pour into cooling water (step S320) always.
Figure 14 is the figure for illustration of other modes in embodiments of the present invention 5.General on rolling line, be not only provided with the ROT32 shown in Figure 12, but also be provided with the roller roller 64 for transmitting material in more place.Figure 14 is the figure it being carried out to vague generalization description, roller roller cooling device 66 is configured with between roller roller 64, in certain period in the process transmitting stocking and after having carried out stocking transmitting, by carrying out water filling from roller roller cooling device 66, carry out cooling roller bed roller 64.Roller roller cooling device 66 is connected with the outlet side of control device 60.
In this case, also identical with Figure 12, after having carried out stocking 12 transmitting, and non-continuous carries out water filling, but carries out repetition by separating certain hour to water filling and not water filling, thus improves cooling effectiveness.In addition, due to comparatively large from the heat of stocking acceptance in the process transmitting stocking 12, therefore pour into cooling water always.
Structure according to the present embodiment, when roller roller 62 or 64 does not transmit stocking 12, can reduce the cooling water flow needed for cooling roller bed roller 62,64.Thus, by improving cooling effectiveness, and reduce water injection rate, thus the electricity of the pump etc. for cooling water circulation can be reduced.Therefore, it is possible to the energy consumption in minimizing rolling.
Embodiment 6.
In embodiment 6, control to be described to the cooling of Rolling roller.Generally speaking, when utilizing Rolling roller to carry out rolling and high-temperature stocking, causing due to the heat from stocking roll temperature to rise, and causing thermal expansion, therefore in order to suppress thermal expansion and protection roller, pair roller to cool.In the process of rolling, need to pour into cooling water always.Namely on the other hand, not being rolled under so-called idling conditions, the water injection rate of cooling water is is also increased and decreased sometimes according to rolling interval.
In embodiments of the present invention 6, in the idling condition, while cooling water quantitative limitation within considering the temperature upper limit for being cooled to Rolling roller, determine the rotating speed of Rolling roller and the cooling water inflow of Rolling roller, minimum with the energy consumption sum needed for making the energy consumption for rotating Rolling roller, pouring into the cooling water for cold rolling roller.In order to make the heat being present in Rolling roller inside easily spread out of surface, making roller slow circumvolve, carrying out suitable distribution for separating the efficiency of carrying out the rotary speed of the time interval and the roller cooled by cooling water.
Figure 15 is the figure for illustration of the feature structure in embodiments of the present invention 6.Figure 15 is the enlarged drawing of the rolling machine frame 24 shown in Fig. 1.Rolling machine frame 24 is described above, comprises as the working roll (WR:Work Roll) 26 of Rolling roller, backing roll (BUR:Back Up Roll) 28 and roller cooling device 48.Roller cooling device 48 is separately positioned on entrance side, the outlet side of rolling machine frame 24.Specifically, roller cooling device 48 is by working roll 26 being poured into the WR cooling device 48a of indirect cooling water and forming the BUR cooling device 48b that backing roll 28 pours into indirect cooling water.In explanation below, when not distinguishing cooling device 48a, 48b especially, be simply called roller cooling device 48.In addition, by the indirect cooling water that pours into from roller cooling device 48 also referred to as roller cooling water.
Figure 16 is the figure be described for the change of the roll surface temperature in the predetermined portions to working roll 26 surface.As shown in figure 15, from the WR cooling device 48a being arranged at two positions, water filling is carried out to working roll 26.Therefore, above-mentioned predetermined portions cools twice when roller rotates a circle.When Figure 16 illustrating working roll 26 low speed rotation, cooling water gets to the summary of the time of working roll 26 and the change of roll surface temperature.When illustrating working roll 26 High Rotation Speed under Figure 16, cooling water gets to the summary of the time of working roll 26 and the change of roll surface temperature.
As shown in figure 16, during low speed rotation, to get to time on roller surface elongated for cooling water compared with during High Rotation Speed, and the time to cooling water gets to surface next time is also elongated.Therefore, it is possible to the time that the heat making working roll inside have spreads out of surface becomes abundant.Consequently, roll surface temperature uprises, and can more efficiently cool.
Figure 17 is the figure for illustration of the feature structure in embodiments of the present invention 6.According to the above-mentioned explanation of Figure 16, although preferred low speed rotation, also will consider the waste etc. of the efficiency of the motor that roller is rotated, roller mechanical system, not low speed is more energy-conservation.Figure 17 is the figure of the relation illustrated simply between the rotating speed of roller and power consumption.Generally speaking, if the rotating speed of motor is little, efficiency is poor, and when this external roller mechanical system middle (center) bearing be combined with motor is the solid greases such as grease, the resistance that in low speed rotation, adhesiveness causes becomes large.Therefore the power consumption curve shown in Figure 17 is obtained sometimes.Now under the condition of some A, B, C, to the power consumption of the motor of driven roller and provided the electricity of the pump of roller cooling water to carry out prediction and calculation respectively under 3 o'clock, from certain some A, B, C a bit in select the power consumption of the motor of driven roller and operating point when providing the power consumption sum of the pump of roller cooling water minimum, run at this point.
Figure 18 is the flow chart in order to realize the control program that above-mentioned action is performed by control device 60.In program shown in Figure 18, first, the idling conditions (step S400) of the non-rolling in-process stock 12 of working roll 26 be in as Rolling roller is determined whether.
When being in the idling conditions of the non-rolling in-process stock 12 of working roll 26, control device 60 makes working roll 26 run in low rotary area.In addition, multiple operating points in low rotary area (such as, by the roller rotating speed that three shown in some A, B, C are different in Figure 17) under, to driving the power consumption of the motor of working roll 26 and calculating (step S410) the power consumption of the motor providing the pump of roller cooling water to drive.In addition, also can in advance the above-mentioned electricity under multiple operating point be measured and be stored.
Next, control device 60 select the motor driving working roll 26 power consumption, with the operating point (step S420) that provides the power consumption sum of the pump of roller cooling water minimum.Afterwards, control device 60 selected go out operating point (roller rotating speed) under make working roll 26 carry out action.
On the other hand, in step S400, when being judged to not to be in idling conditions, control device 60 pours into the cooling water (step S430) of the water yield needed for roller cooling device 48 always.
S
According to this structure, when the non-rolling in-process stock of Rolling roller, while raising cooling effectiveness, the power consumption of the motor of driving Rolling roller can be made, with minimum to the power consumption sum of the motor providing the pump of roller cooling water to drive.Cool efficiently owing to the energy making Rolling roller rotate also can be taken into account, therefore, it is possible to reduce total energy consumption.
Label declaration
10 thin plate hot-rolling mills
12 stockings
14 heating furnaces
16,20 descalers
18 roughing mills
22 finishing mills
24,24a-24d rolling machine frame
26,26a-26d working roll
28 backing rolls
30 fine finishining outlet side thermometers
32 runout tables (ROT:Run Out Table)
34 coiling temperature meters
36 coiling machines
38 casings
40 purification cooling processing devices
42 cooling water pits
44 pumps
46 motor
48 roller cooling devices
48a WR cooling device
48b BUR cooling device
50,50a-50c interstand cooling device (ISC)
52 cold beds
54,54a-54e ROT water filling device
60 control device
62,64 roller rollers
66 roller roller cooling devices
Claims (1)
1. an energy saver for rolling equipment, comprising:
Rolling roller, this Rolling roller is arranged on rolling machine frame, and is rolled the stocking of metal material;
Roller cooling device, this roller cooling device is to described Rolling roller perfusion cooling water;
Identifying unit, this identifying unit judges the idling conditions whether described Rolling roller is in stocking described in non-rolling;
Rolling roller power consumption acquiring unit, this Rolling roller power consumption acquiring unit is under described idling conditions, and the multiple operating points in low speed rotation region, obtain the power consumption for driving described Rolling roller respectively;
Pump power consumption acquiring unit, this pump power consumption acquiring unit, under described idling conditions, at described multiple operating point, obtains respectively and provides the pump of cooling water to carry out the power consumption driven for roller cooling device described in subtend; And
Operating point selection unit, this operating point selection unit under described idling conditions, in described multiple operating point, select for drive the power consumption of described Rolling roller, with operating point for driving the power consumption sum of described pump minimum,
Described low speed rotation region is for driving the power consumption of described Rolling roller to decline according to the decline of the rotating speed of described Rolling roller, and the region increased when rotating speed declines further.
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| CN201510347021.5A CN104998916B (en) | 2011-08-30 | 2011-08-30 | Energy-saving device of rolling device |
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| CN201180073192.3A CN103764306B (en) | 2011-08-30 | 2011-08-30 | The energy saver of rolling equipment |
| CN201510347021.5A CN104998916B (en) | 2011-08-30 | 2011-08-30 | Energy-saving device of rolling device |
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| CN201180073192.3A Division CN103764306B (en) | 2011-08-30 | 2011-08-30 | The energy saver of rolling equipment |
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| TWI748169B (en) * | 2019-02-04 | 2021-12-01 | 日商東芝三菱電機產業系統股份有限公司 | Speed control device for lifting pump |
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